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Ashanite (Ashanit)

Collectors Summary

Color dunkelbraun
Streak color braun
Lustre Halbmetallglanz, Wachsglanz
Hardness (Mohs) 6.00 - 6.50
Cleavages fehlt
Crystal System orthorhombisch, Pbcn

Additional information / Summary

Gemenge aus Ixiolit, Samarskit-(Y) und Uranmikrolith

Chemism

Chemical formula

(Nb,Ta,Fe,Mn,U)4O8

Chemical composition

Eisen, Mangan, Niob, Tantal, Sauerstoff, Uran

Unit weight: 594.26886298 u; Number of atoms in the formula: 12

Info

Empirical formula:

(Nb0.55Ta0.25Fe0.1Mn0.05U0.05)4O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

21.54

8

66.67

15.9994300

127.9954400

Manganese

Mn

1.85

0.2

1.67

54.9380499

10.9876100

Iron

Fe

3.76

0.4

3.33

55.8452000

22.3380800

Niobium

Nb

34.39

2.2

18.33

92.9063820

204.3940404

Tantalum

Ta

30.45

1

8.33

180.9479100

180.9479100

Uranium

U

8.01

0.2

1.67

238.0289130

47.6057826

Analysis wt%

Nb2O5 : 36.76, Ta2O5 : 23.41, FeO : 8.25, MnO : 7.77, U3O8 : 23.81, Ln2O3 : 1.40 (Ref: Kexue Tongbao 80)

Classification by Hölzel

4.DH.230

4: OXIDES
D: Dioxides
H: Wolframite-Group

IMA status

diskreditiert

Mineral status

Gemenge/Gemisch/Mischkristall

Optical Properties

Color

dunkelbraun

Streak color

braun

Diaphaneity (Transparency)

durchscheinend

Lustre

Halbmetallglanz, Wachsglanz

max. Birefringence

0.09

Birefringence chart\! Ashanite title=Birefringence chart Ashanite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

2.31

RI value β

2.35

RI value γ / ε

2.40

Ri mean

2.353

2V angle

Biaxial (+) 70° - 75° (gemessen) 83.6° (berechnet)

Dispersion

X = b, Y = a, Z = c

Absorption

Z > X

Pleochroism

Schwach, dunkel braunrot zu hell braunrot

Reflectivity: (Lambda nm) ↓, ↑, Ø

(440) 12.10, 12.10, 12.10
(460) 11.40, 11.50, 11.45
(480) 11.20, 11.30, 11.25
(500) 11.00, 11.00, 11.00
(520) 11.00, 11.00, 11.00
(540) 10.90, 10.90, 10.90
(560) 10.90, 10.80, 10.85
(580) 10.80, 10.80, 10.80
(600) 10.80, 10.70, 10.75
(620) 10.70, 10.70, 10.70
(640) 10.70, 10.60, 10.65
(660) 10.60, 10.60, 10.60
(680) 10.60, 10.60, 10.60
(700) 10.60, 10.60, 10.60

Reflection chart Ashanite

Reflectivity Ø

10.95

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

60

Space Group

Pbcn

Cell parameters a (Å)

5.869

Cell parameters b (Å)

4.873

Cell parameters c (Å)

5.216

Cell parameters a/b or c/a

1.204

Cell parameters c/b

1.070

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volume (ų)

149.176

X-Ray Powder Diffraction

3.65(50),
2.95(100),
2.54(30),
2.51(30),
2.38(30),
1.729(30)

XRD chart Ashanite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)

6.00 - 6.50

Density (g/cm³)

6.61 (gemessen)

6.615 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

Preface

Author (Name, Year)

Zhang & Tian & Peng & Ma & Han & Jing, 1980

References

Zhan Rubo, Tian Huixin, Peng Zhizhong, Ma Zhesheng, Han Fengming, and Jing Zebei (1980): A new mineral - Ashanite, (Nb,Ta,U,Fe,Mn)4O8. Chinese Science Bulletin [Kexue Tongbao] 25(6), 510-514 (in Englisch). - American Mineralogist (1981) 66, 217 (Abstrakt).

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 27.

Acta Mineralogica Sinica (in Chinese) 18 (2) (1998), 230.

N. V. Zubkova, N. V. Chukanov, I. V. Pekov, B. Ternes, W. Schüller, D. Yu. Pushcharovskii: Ta-Free Nb-Dominant Ixiolite Analogue from the Eifel Paleovolcanic Region, Germany, and Its Crystal Structure. On the Problem of “Ashanite”. Geology of Ore Deposits Vol. 63, Nr. 8 (2021) S. 805–811.

Other languages

German

Ashanit

English

Ashanite

Japanese

アシャナイト

Alternative Name

Spanish

Ashanita

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Cc2zv1Ggikalzqs6ZHtSgQ
GUID (Global unique identifier) BFB3CD09-A051-468A-A5CE-AB3A647B5281
Database ID 222